Nylon cable jacket material and method of making same

Abstract

The application discloses a nylon cable sheath material and a preparation method thereof. The nylon cable sheath material comprises the following components in parts by weight: 80-90 parts of long carbon chain nylon, 0-12 parts of plasticizer, 0-5 parts of modified wear-resistant auxiliary agent, 0-2 parts of chain extender, 0-2 parts of antioxidant, 0-2 parts of light stabilizer and 0-2 parts of lubricant. The material is produced through a double-screw extrusion granulation process, has good wear resistance, high hardness and termite resistance, and has application prospects in the field of cable sheaths.

Description

Technical Field

[0001] This invention belongs to the field of nylon material technology, and relates to a nylon cable sheath material and its preparation method. Background Technology

[0002] Cables laid in humid tropical and subtropical regions are often threatened by local termites during long-term use. Termite gnawing and formic acid corrosion can damage the cable's outer sheath, leading to decreased insulation performance and even grounding short circuits. Over time, ordinary cables in termite-prone areas have shorter lifespans, more frequent failures, and higher maintenance costs, hindering their widespread application. Furthermore, the transportation, laying, and use of cables involve dragging and friction, demanding increased abrasion resistance from the cable's outer sheath.

[0003] To address the problem of termite infestation, termite-proof cables have been developed and researched in this field. Protection methods include chemical and physical approaches. Chemical methods involve adding chemical agents to the sheath layer to repel or kill termites, thus achieving termite prevention. The advantage is its simplicity, requiring no changes to the original cable structure. However, the disadvantage is that the added chemicals are typically insecticides such as pyrethroids, aldrin, and dieldrin, which gradually leach out during production, use, transportation, and installation, affecting human health and causing environmental pollution. Furthermore, over time, the concentration of these chemicals decreases, leading to a decline in their protective effect, making long-term protection difficult. Physical methods typically involve adding a sheath layer to the outer layer of the cable. This sheath layer is more rigid, resistant to termite bites, and has some resistance to formic acid, thus achieving a long-term, pollution-free termite-proof effect. Commonly used cable sheath layers include PA11, PA12, and high-hardness polyolefins.

[0004] Patent CN101633756B proposes a high-hardness polyolefin sheath material, using ultra-high molecular weight polyethylene as the base material and adding toughening modifiers and processing modifiers to develop a physical termite-resistant sheath material. It has advantages such as wide availability of raw materials and simple processing, but its termite protection level is only level two. Patent CN 116092731 A discloses a wear-resistant wire using nylon 12 as the outer sheath layer, but the nylon material used has not been specifically developed, and its wear resistance has not been optimized, posing a risk of failure due to wear during long-term use. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention proposes a pollution-free nylon cable sheath material with excellent wear resistance and permanent termite protection, as well as its preparation method.

[0006] To achieve the objectives of this invention, the technical solution is as follows:

[0007] A nylon cable sheath material, comprising the following components in parts by weight:

[0008] 80-90 parts of nylon

[0009] 0-12 parts of plasticizer, preferably 7-10 parts;

[0010] 0-5 parts of modified wear-resistant additive, preferably 1-3 parts;

[0011] Chain extender 0-2 parts, preferably 0.5-1.5 parts;

[0012] Antioxidant 0-2 parts, preferably 0.5-1 parts;

[0013] 0-2 parts of light stabilizer, preferably 0.5-1 part;

[0014] Lubricant 0-2 parts, preferably 0.5-1 parts;

[0015] The amount of chain extender added is not zero;

[0016] Preferably, the amount of modified wear-resistant additive added is not zero.

[0017] The nylon is one or more of nylon 1012, nylon 11, nylon 12, nylon 1212, etc. Preferably, the nylon is nylon 12, which has good processing performance, moderate hardness, and good resistance to various chemicals.

[0018] The plasticizer is one or more of the following: methylbenzenesulfonamide, butylbenzenesulfonamide, phthalate ester, triphenyl phosphate epoxy ester, polyester plasticizer, etc. Preferably, the plasticizer is butylbenzenesulfonamide.

[0019] The modified wear-resistant agent is one or more of the following: tin disulfide, zinc disulfide, molybdenum disulfide, graphite, and silicon carbide, all modified by surface hydroxylation. Preferably, the wear-resistant agent is molybdenum disulfide modified by surface hydroxylation.

[0020] Add the wear-resistant additive to a 10-20% sodium hydroxide solution, heat to 50-80℃, heat for 0.5-1h, then wash with deionized water, filter and dry to obtain a surface hydroxylated modified wear-resistant additive.

[0021] The chain extender is one or more of the following: carbodiimide, oxazoline, isocyanate, peroxide, epoxy group-containing copolymer, etc. Preferably, the chain extender is carbodiimide.

[0022] The antioxidant is one or more of hindered phenols, phosphites, thioesters, phosphates, etc. Preferably, the antioxidant is a 0.5-2:1 mixture of antioxidant 1098 and antioxidant 168.

[0023] The light stabilizer in the nylon cable sheath material is a benzophenone derivative, salicylic acid derivative, benzotriazole derivative, triazine derivative, or organonickel derivative, etc. Preferably, the light stabilizer is a benzotriazole derivative.

[0024] The nylon cable sheath material is provided, and the lubricant is one or more of polyethylene wax, stearate, long-chain carboxylate, etc.

[0025] The present invention also provides a method for preparing the nylon cable sheath material, wherein the raw material nylon, optional modified wear-resistant additives, chain extenders, optional antioxidants, optional light stabilizers, and optional lubricants are mixed evenly and added to a twin-screw extruder, and the plasticizer is injected into the extruder through a liquid pump, and the mixture is extruded and granulated.

[0026] Extrusion temperature 240-270℃.

[0027] The beneficial effects of this invention are as follows:

[0028] (1) In this invention, a chain extender, carbodiimide, is added to nylon resin material. The C=N bond in carbodiimide can react with the carboxyl group at the end of nylon to achieve the growth of nylon molecular chain, increase the molecular weight of nylon material, and further improve its wear resistance.

[0029] (2) This invention obtains molybdenum disulfide with hydroxyl groups on its surface by surface treatment of molybdenum disulfide. Carbodiimide reacts with the hydroxyl groups on the surface of molybdenum disulfide and the polar groups in the nylon resin, which improves the bonding between the resin and molybdenum disulfide, allowing the wear-resistant additive to be fully dispersed in the resin and avoiding agglomeration. Carbodiimide and molybdenum disulfide have a synergistic effect, which improves the wear resistance and mechanical properties of the material.

[0030] (3) The cable sheath material provided by the present invention has good permanent termite protection performance and will not cause pollution to the environment. Detailed Implementation

[0031] To facilitate understanding of the present invention, the following description, in conjunction with embodiments, will further illustrate the invention. It should be understood that the following embodiments are merely for a better understanding of the invention and do not imply that the invention is limited to these embodiments.

[0032] Raw materials and sources

[0033] Long-chain nylon PA12, L3000, Wanhua Chemical

[0034] Plasticizer, N-butylbenzenesulfonamide, commercially available

[0035] Molybdenum disulfide, commercially available

[0036] Graphite, commercially available

[0037] Carbodiimide, S9000, Lassig

[0038] Epoxy copolymer, ADR4468, BASF

[0039] Hexamethylene diisocyanate, HDI, Wanhua Chemical

[0040] Antioxidant, a 1:1 mixture of antioxidant 1098 and antioxidant 1681, commercially available.

[0041] Light stabilizer, UV312, BASF

[0042] Lubricant, E-wax, Clariant

[0043] Test standards or methods

[0044] Elongation at break under tension, obtained according to ISO 527 test.

[0045] Tensile yield strength, obtained according to ISO 527 test.

[0046] Notched impact strength of a simply supported beam, obtained according to ISO 179 test.

[0047] Shore hardness, obtained according to ISO 2039.

[0048] Taber wear, according to ASTM D3884, 1kg load.

[0049] Termite control experiment, group method

[0050] Preparation method of surface-modified wear-resistant additive: The wear-resistant additive is added to a 20% sodium hydroxide solution, heated to 70°C, and heated for 1 hour. Afterwards, it is washed with deionized water, filtered, and dried to obtain the surface-hydroxylated modified wear-resistant additive. Example

[0051] Weigh the raw materials (excluding plasticizer) according to the weight proportions in Table 1, mix the raw materials evenly, add them to the twin-screw extruder, inject the plasticizer into the extruder through a liquid pump, the extrusion temperature is 260℃, the speed is 300rpm, the extruded material is cooled by a water tank, dried by an air knife, and granulated by a pelletizer.

[0052] Table 1. Raw materials and properties of examples and comparative examples.

[0053]

[0054]

[0055] As can be seen from the comparison between Example 1 and Comparative Examples 1 and 2, compared with nylon materials that have not been specifically optimized, the material provided by the present invention has better wear resistance, good termite resistance, and adjustable hardness to meet the needs of cables of different sizes.

[0056] As can be seen from the comparison between Example 1 and Comparative Examples 3 and 4, carbodiimide and hydroxylated molybdenum disulfide have a synergistic effect, and the wear resistance and elongation at break of the material are significantly improved.

[0057] In summary, the nylon cable sheath material provided by this invention has advantages such as wear resistance and permanent termite protection, and has a wide range of applications in the field of wires and cables.

[0058] Although the invention has been described in detail above for illustrative purposes, it should be understood that such detailed description is merely for illustration, and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention, which is defined only by the claims.

Claims

1. A nylon cable jacket material characterized by, The components include the following parts by weight: 80-90 parts of nylon 0-12 parts of plasticizer, preferably 7-10 parts; 0-5 parts of modified wear-resistant additive, preferably 1-3 parts; Chain extender 0-2 parts, preferably 0.5-1.5 parts; Antioxidant 0-2 parts, preferably 0.5-1 parts; 0-2 parts of light stabilizer, preferably 0.5-1 part; Lubricant 0-2 parts, preferably 0.5-1 parts; The amount of chain extender added is not zero; Preferably, the amount of modified wear-resistant additive added is not zero.

2. The nylon cable jacket material of claim 1, wherein, The nylon is one or more of nylon 1012, nylon 11, nylon 12, nylon 1212, etc. Preferably, the nylon is nylon 12; Preferably, the plasticizer is a mixture of one or more of methylbenzenesulfonamide, butylbenzenesulfonamide, phthalate, triphenyl phosphate epoxy ester, and polyester plasticizer; preferably, the plasticizer is butylbenzenesulfonamide.

3. The nylon cable jacket material of claim 1, wherein, The modified wear-resistant additive is one or more of tin disulfide, zinc disulfide, molybdenum disulfide, graphite, and silicon carbide that have been surface-hydroxylated; preferably, the wear-resistant additive is molybdenum disulfide that has been surface-hydroxylated.

4. The nylon cable jacket material of any of claims 1-3, wherein, Add the wear-resistant additive to a 10-20% sodium hydroxide solution, heat to 50-80℃, heat for 0.5-1h, then wash with deionized water, filter and dry to obtain a surface hydroxylated modified wear-resistant additive.

5. The nylon cable sheath material according to any one of claims 1-4, characterized in that, The chain extender is one or more of the following: carbodiimide, oxazoline, isocyanate, peroxide, epoxy group-containing copolymer, etc. Preferably, the chain extender is carbodiimide.

6. The nylon cable sheath material according to any one of claims 1-5, characterized in that, The antioxidant is one or more of hindered phenols, phosphites, thioesters, phosphates, etc. Preferably, the antioxidant is a 0.5-2:1 mixture of antioxidant 1098 and antioxidant 168. Preferably, the light stabilizer is a benzophenone derivative, salicylic acid derivative, benzotriazole derivative, triazine derivative, or organonickel derivative; preferably, the light stabilizer is a benzotriazole derivative. Preferably, the lubricant is a mixture of one or more of polyethylene wax, stearate, and long-chain carboxylate.

7. A method for preparing nylon cable sheath material according to any one of claims 1-6, comprising mixing raw nylon, optional modified wear-resistant agent, chain extender, optional antioxidant, optional light stabilizer, and optional lubricant evenly, adding the mixture to a twin-screw extruder, and injecting optional plasticizer into the extruder via a liquid pump, and extruding and granulating the mixture.

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